[polari] ci: rename meson_args env var

[Jordan Petridis <jpetridis src gnome org>]

commit 222dfb5488eb412fb06ef1d9bfd6cefd70b2f0e9
Author: Jordan Petridis <jpetridis gnome org>
Date:   Mon Aug 3 21:32:09 2020 +0000

    ci: rename meson_args env var
    
    We can now keep in sync with the args in the manifest.
    
    Thus the config var was moved to a standalone one to override the
    conf-opts.

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 28474566..5414d1de 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -48,7 +48,7 @@ eslint:
 flatpak:
     variables:
         BRANCH: "snapshot"
-        MESON_ARGS: "-Dsnapshot=true --werror --warnlevel 2"
+        CONFIG_OPTS: "-Dsnapshot=true --werror --warnlevel 2"
     extends: .flatpak-template
     except:
         - master